#1F387A
Closest named color: Twilight Blue (#0A437A). oklch(36.2% 0.117 265.3), rgb(31, 56, 122).
Aa
White text reads best on this color (11.02:1).
About this color
#1F387A is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.117 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.032 away. White text reads best on it, at 11.02:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.90:1 |
| White text | 11.02:1 |
Values
| HEX | #1F387A |
| RGB | rgb(31, 56, 122) |
| HSL | hsl(224, 59%, 30%) |
| OKLCH | oklch(36.2% 0.117 265.3) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #1F387A | 11.02:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #1F387A | 1.90:1 | Fails | Lc 8.8 | Not readable |
| #1F387A text on white | 11.02:1 | AAA | Lc 95.1 | Preferred for body text |
| #1F387A text on black | 1.90:1 | Fails | Lc -7.5 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 900.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CAD9FA
oklch(88.5% 0.048 266)
-
Step 300
300
#A5C0FA
oklch(80.9% 0.088 265.1)
-
Step 400
400
#769DF8
oklch(70.7% 0.141 265.4)
-
Step 500
500
#5482F4
oklch(63.2% 0.178 265.2)
-
Step 600
600
#3A68E3
oklch(55.6% 0.194 265.1)
-
Step 700
700
#2D55C5
oklch(49% 0.181 265.3)
-
Step 800
800
#2646A0
oklch(42.6% 0.151 265.5)
-
Step 900
900 (this color)
#1F387A
oklch(36.2% 0.117 265.3)
-
Step 950
950
#15244A
oklch(27% 0.073 265.6)
#1F387A with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #0C407C | 0.024 |
| Deuteranopia (no green cones) | #003879 | 0.022 |
| Tritanopia (no blue cones) | #004853 | 0.094 |
| Achromatopsia (no color) | #3C3C3C | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F387A
#1F387A
oklch(36.2% 0.117 265.3)
- #4F3A00
#4F3A00
oklch(36.2% 0.074 85.7)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #1F387A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.032
- Marine Blue #01386A ΔE 0.037
- Cobalt #1E488F ΔE 0.054
- Marine #042E60 ΔE 0.060
- Prussian Blue #1D3557 ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.069
- Light Navy #155084 ΔE 0.069
- Dark Grey Blue #29465B ΔE 0.076
Use #1F387A in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.